00194614-08 Trainingsdoku. SG X-Serie_X4i SW70x (AL2)_EN.pdf - 第233页

C&P20A Reference Run for C&P20A Head Determining the Vacuum and Thr esho ld Values 233 Student Guide SIPLACE X-Serie and X4I SW70x (AL2) Determinin g the Vacuum and T hreshold Values 7.3.7 Determining the Vacu um…

C&P20A

Height Reference Run Reference Run for C&P20A Head

Student Guide SIPLACE X-Serie and X4I SW70x (AL2) 232

Sequence of Height Reference Run

7.3.6.1 Sequence of Height Reference Run

Height reference run flow chart

C&P20A

Reference Run for C&P20A Head Determining the Vacuum and Threshold Values

233 Student Guide SIPLACE X-Serie and X4I SW70x (AL2)

Determining the Vacuum and Threshold Values

7.3.7 Determining the Vacuum and Threshold Values

Measuring and calculating the vacuum values for a reference run

▪ The vacuum is measured twice at the reference point: first with open and then with closed nozzle

tips.

▪ The value with closed segment does no longer depend on the ambient pressure it is controlled by

the pressure control valve. The nozzle fit (nozzle pickup error) and the quality (contamination/

damage) of the nozzle tip influence the vacuum measurement values.

▪ The value by open pressure control valve depends on the nozzle size and condition. The smaller the

nozzle, the greater the open valve value will be. This nozzle-specific value is preset by the SIPLACE

Pro computer. A contaminated or blocked nozzle will also give a higher valve.

▪ The difference between the open and closed nozzles has been preset by the programming system

as an ideal case minimum value. This value is different for all nozzle types e.g. 120 mbar for 1004,

1014 nozzles. If these values are not achieved, the error message “Vacuum difference open-closed

is too low” will appear.

▪ The threshold for component acceptance is also set now. Assumed are following values for a 1004

nozzle: a value of 660 mbar when the nozzle is open and a value of 852 mbar when the nozzle is

closed. The calculation is performed as follows:

Vacuum distance = (852 (closed) - 660 (open))= 192 mbar

This is greater than the vacuum distance required in the parameter specifications for this nozzle type

(120 mbar). The open vacuum of 660 mbar is significantly greater than the required 250 mbar.

C&P20A

Measuring Z Axis Position for Component Recognition by the Component Sensor Pickup and Placement Cycle for C&P20A

Student Guide SIPLACE X-Serie and X4I SW70x (AL2) 234

Measuring Z Axis Position for Comp onent Rec ognition by the C omponent Sensor

7.3.8 Measuring Z Axis Position for Component Recognition by the Component Sensor

While the Z axis moves downwards, the nozzle interrupts the laser beam of the component sensor. The

axis position is saved and later used for the calculation of the component height and component

presence. At the upwards movement of the Z axis, the laser beam is no longer interrupted and the axis

position is saved again. The component presence can be determined during placement by the

programmed component height (SIPLACE Pro) and the nozzle length, calculated during the height

reference run by the Z axis position counter.

Pickup and P lacement Cycle for C&P20A

7.4 Pickup and Placement Cycle for C&P20A

Working Position on Placement Head

7.4.1 Working Position on Placement Head

Nozzle length measurement at reference run for

component recognition

Legend

1. Component sensor

2. Nozzle

3. Receiver

4. Transmitter

During the height reference run, the component sensor

measures the Z axis position for each segment, to detect

the presence/absence of components in the pickup and

placement position. During placement the Component

Sensor can also recognize dirty nozzles.

Working Position on Placement Head

Legend

1. Optical centering (component camera)

2. Vacuum measurement holding circuit

3. Vacuum measurement placement circuit

4. Pickup/placement station and reject position

5. Position of component sensor

6. Working direction